3.3.5.4.2 Clean-Up Processing

A resource IP/STS SHOULD send wsignoutcleanup1.0 messages to WS resources for which security tokens have been issued. Because the protocol does not guarantee a response to a wsignoutcleanup1.0 message, a resource IP/STS SHOULD delete any session state that has been locally cached for the web browser requestor before sending wsignoutcleanup1.0 messages to WS resources.<80>